312521 has 4 divisors (see below), whose sum is σ = 340944. Its totient is φ = 284100.

The previous prime is 312517. The next prime is 312527. The reversal of 312521 is 125213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125213 = 11 ⋅11383.

It is a cyclic number.

It is not a de Polignac number, because 312521 - 2² = 312517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312496 and 312505.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312521.

It is not an unprimeable number, because it can be changed into a prime (312527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14195 + ... + 14216.

It is an arithmetic number, because the mean of its divisors is an integer number (85236).

2³¹²⁵²¹ is an apocalyptic number.

It is an amenable number.

312521 is a deficient number, since it is larger than the sum of its proper divisors (28423).

312521 is a wasteful number, since it uses less digits than its factorization.

312521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28422.

The product of its digits is 60, while the sum is 14.

The square root of 312521 is about 559.0357770304. The cubic root of 312521 is about 67.8619604547.

Adding to 312521 its reverse (125213), we get a palindrome (437734).

It can be divided in two parts, 31 and 2521, that added together give a palindrome (2552).

The spelling of 312521 in words is "three hundred twelve thousand, five hundred twenty-one".